Represents the destination of the message, consisting of To:, CC:, and BCC: fields.

Amazon SES does not support the SMTPUTF8 extension, as described in RFC6531. For this reason, the local part of a destination email
address (the part of the email address that precedes the @ sign) may only contain 7-bit ASCII characters. If the domain part
of an address (the part after the @ sign) contains non-ASCII characters, they must be encoded using Punycode, as
described in RFC3492.